Skip flaky test_top_k onnx op test on rdna3.

[ScottTodd]

Disabled due to flaky behavior tracked at #18649.

Recent logs: https://github.com/iree-org/iree/actions/runs/13957484655/job/39072362817#step:8:51

=================================== FAILURES ===================================
___ IREE compile and run: test_top_k::model.mlir::model.mlir::gpu_rocm_rdna3 ___
[gw0] linux -- Python 3.11.9 /home/esaimana/actions-runner-2/_work/iree/iree/venv/bin/python
Error invoking iree-run-module
Error code: 1
Stderr diagnostics:

Stdout diagnostics:
EXEC @test_top_k
[FAILED] result[1]: element at index 5 (0) does not match the expected (1); expected that the view is equal to contents of a view of 3x3xi64
  expected:
3x3xi64=[3 2 1][3 2 1][3 2 1]
  actual:
3x3xi64=[3 2 1][3 2 0][3 2 1]

Test case source:
  https://github.com/iree-org/iree-test-suites/blob/main/onnx_ops/onnx/node/generated/test_top_k

Input program:
```
module {
  func.func @test_top_k(%arg0: !torch.vtensor<[3,4],f32>, %arg1: !torch.vtensor<[1],si[64](https://github.com/iree-org/iree/actions/runs/13957484655/job/39072362817#step:8:65)>) -> (!torch.vtensor<[3,3],f32>, !torch.vtensor<[3,3],si64>) attributes {torch.onnx_meta.ir_version = 6 : si64, torch.onnx_meta.opset_version = 17 : si64, torch.onnx_meta.producer_name = "backend-test", torch.onnx_meta.producer_version = ""} {
    %none = torch.constant.none
    %0:2 = torch.operator "onnx.TopK"(%arg0, %arg1) {torch.onnx.axis = 1 : si64} : (!torch.vtensor<[3,4],f32>, !torch.vtensor<[1],si64>) -> (!torch.vtensor<[3,3],f32>, !torch.vtensor<[3,3],si64>) 
    return %0#0, %0#1 : !torch.vtensor<[3,3],f32>, !torch.vtensor<[3,3],si64>
  }
}

```

Compiled with:
  cd /home/esaimana/actions-runner-2/_work/iree/iree/iree-test-suites/onnx_ops/onnx/node/generated/test_top_k && iree-compile model.mlir --iree-hal-target-backends=rocm --iree-hip-target=gfx1100 --iree-input-demote-f64-to-f32=false -o model_gpu_rocm_rdna3.vmfb

Run with:
  cd /home/esaimana/actions-runner-2/_work/iree/iree/iree-test-suites/onnx_ops/onnx/node/generated/test_top_k && iree-run-module --module=model_gpu_rocm_rdna3.vmfb --device=hip --flagfile=run_module_io_flags.txt

ci-exactly: build_packages, test_onnx

[benvanik]

feel better about disabling now that the issue is being looked at - maybe tag the issue in the json? (hopefully it's jsonc?)

[ScottTodd]

It is jsonc, but the files are also autogenerated, and the autogeneration does not preserve comments (or other local edits like ordering changes). I put enough context in here for the blame layer to be useful.

[benvanik]

ahh gotcha!